ASTM A320 L7 — Chemical Composition & Mechanical Properties
ASTM A320 L7 is an ASTM specification for stud bolts / bolting (UNS G41400). This sheet summarises its chemical composition limits and minimum mechanical properties. Typical use: low-temperature flange bolting to -101 °C (dia ≤ M65 / 2½ in.).
Chemical composition of ASTM A320 L7 (weight %)
Mechanical properties
| Tensile strength, min | 860 MPa |
|---|---|
| Yield strength, min | 725 MPa |
| Elongation, min | 16 % |
| Hardness | 321 HBW (35 HRC) |
Heat treatment
Quenched & tempered, 593 °C min temper; Charpy V 27 J avg / 20 J min at -101 °C
Typical service
Low-temperature flange bolting to -101 °C (dia ≤ M65 / 2½ in.)
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
FAQ
ASTM A320 L7: common questions
What is the minimum yield strength of ASTM A320 L7?
725 MPa, with a minimum tensile strength of 860 MPa.
What is the carbon content of ASTM A320 L7?
0.38–0.48 %.
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